I have been struggling with the EXACT problem for a couple of days now... even went as far as formatting my HDD and re-installing eSmith 412 again!!
I thought that backing up >2GB to desktop would be fine, but windows 2000 doesn't like that size so eSmith restore command doesn't work either.. had to rebuild EVERYTHING from scratch, fortunately I had spot backups of the important parts, now I AM up and running...
How did I fix it? It **WAS** the ISP's fault!
Two days ago they "upgraded" their broadband server, and as they are completely Windows centric, they didn't think of our (linux users) particular requirements. After going through hoops for the last 18 hours or so, finally I convinced the lead engineer to look at my port's setup, he did... he reset the connection and everything is working beautifully again!
I emphasised that I do NOT use PPTP, but bridging (using Alcatel SpeedTouch Pro), DHCP client and bridging "forward" - access to the internet and ISP hookup is through PPPoE.
Good luck in convincing your ISP that it is THEIR fault!!
hope this helps
mahmood
http://www.bahraini.tv